How do I install a loft or mezzanine floor?
I need to ask an expert on how to install lofts / mezzanine floors.
Sadly, this is not a question we can answer without a lot more information. Your best bet would be to find a carpenter and an engineer who can come and inspect and measure the area where you want the new floor and advise you on both structural requirements and materials. They will probably also be able to install the thing for you, if you are not set on making it a DIY project.